linux-kernel - Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections -fdata-sections

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Date:	Mon, 20 Apr 2009 16:40:58 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tim Abbott <tabbott@....EDU>
cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Anders Kaseorg <andersk@....EDU>,
	Waseem Daher <wdaher@....EDU>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jeff Arnold <jbarnold@....EDU>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections
 -fdata-sections

On Mon, 20 Apr 2009, Tim Abbott wrote:
>
> Is there a problem that is preventing this -ffunction-sections patch 
> series from being merged?

Quite frankly, every time I see something like this, I shudder.

Why?

The bugs in the toolchains tend to be infinite and _really_ annoying. 
We'll end up with everything from "gcc-xyz cannot handle it" to 
"binutils-abc which was pre-released by RH/Ubuntu/SUSE will SIGSEGV". 

And those are the _good_ cases. The bad cases are just silently 
miscompiled/linked stuff under certain circumstances.

In other words, I'm not going to merge it without a _lot_ of people 
pushing me on it with nice numbers etc. Because I absolutely hate the 
tools issues that I'm convinced will happen the moment I merge it.

		Linus
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